Your hands and wrists are a complex system of bones, muscles and tendons, ligaments, blood vessels and nerves protected by layers of skin. A total of 27 hand and wrist bones are connected to the muscles by tendons. Ligaments join bones together and hold the joints in place. Blood vessels supply nourishment to all these parts. Nerves convey sensations and help to control hand and finger movements.
The skin provides a barrier against chemicals, heat and cold. Skin on the back of the hand is thin and elastic and, on the palm, it is thick to provide traction, cushioning and insulation.